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<?php $r = empty($instance['default_value'][0]['tid']); var_dump($r);
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/kESBP
function name:  (null)
number of ops:  8
compiled vars:  !0 = $r, !1 = $instance
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    2     0  E >   FETCH_DIM_IS                                     ~2      !1, 'default_value'
          1        FETCH_DIM_IS                                     ~3      ~2, 0
          2        ISSET_ISEMPTY_DIM_OBJ                         1  ~4      ~3, 'tid'
          3        ASSIGN                                                   !0, ~4
    3     4        INIT_FCALL                                               'var_dump'
          5        SEND_VAR                                                 !0
          6        DO_ICALL                                                 
          7      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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